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Brain of a 39 year old man, functional magnetic resonance imaging (fMRI) scan (from above). This patient has a malignant (cancerous) tumour in the left hemisphere of the brain. FMRI is used to detect changes in blood flow and blood oxygenation in the brain, and to highlight areas of increased stimulation. Here, the yellow-orange area of the left hemisphere of the brain is part of the motor cortex, which is close to the lesion. It is showing increased activity due to the subject moving their right hand. This helps surgeons to identify the risks involved with surgical intervention.

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